78870181 has 8 divisors (see below), whose sum is σ = 85430520. Its totient is φ = 72380352.

The previous prime is 78870179. The next prime is 78870217. The reversal of 78870181 is 18107887.

It can be written as a sum of positive squares in 4 ways, for example, as 38750625 + 40119556 = 6225^2 + 6334^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78870181 - 2¹ = 78870179 is a prime.

It is a super-2 number, since 2×78870181² = 12441010901945522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78870481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15286 + ... + 19783.

It is an arithmetic number, because the mean of its divisors is an integer number (10678815).

Almost surely, 2^78870181 is an apocalyptic number.

It is an amenable number.

78870181 is a deficient number, since it is larger than the sum of its proper divisors (6560339).

78870181 is a wasteful number, since it uses less digits than its factorization.

78870181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35255.

The product of its (nonzero) digits is 25088, while the sum is 40.

The square root of 78870181 is about 8880.8885253673. Note that the first 3 decimals coincide. The cubic root of 78870181 is about 428.8488789844.

The spelling of 78870181 in words is "seventy-eight million, eight hundred seventy thousand, one hundred eighty-one".